Abstract
The rectangular hyperbolic method (RHM) is a steady-state, finite-system concept that has proved to be amazingly accurate in determining final static reservoir pressure at shut-in. The method also calculates slope, skin, percentage of open reservoir thickness contributing to flow, effective drainage radius, and permeability. It apparently also gives reasonable answers in horizontal-well buildups. It has been found that all wellbore reservoir pressure buildups after al wellbore and storage effects have died out follow rectangular hyperbolic curves. The analysis is based solely on Darcy's steady-state radial-flow equation, the basic transient-pressure-buildup equation, and the determination of effective drainage radius from t/sub m//..mu.. in an empirical equation based on field data obtained from the literature. The RHM is not related to any method based on an infinite-system concept.
Published Version
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